/Engine/Source/Developer/DirectoryWatcher/Public/FileCache.h
Get the state of the directory once finished. Relinquishes the currently stored directory state to the client. Returns nothing if incomplete, or ifGetLiveState()has already been called.
[TOptional](API\Runtime\Core\IO\TOptional)< [FDirectoryState](API\Developer\DirectoryWatcher\FDirectoryState) > GetLiveState()